The patient was perceived to have difficulty in breathing.

发现病人呼吸困难。

Many students have difficulty in delivering a speech in public, but they can overcome it through training.

很多学生觉得当众发表演讲很困难，但通过训练他们可以克服这一问题。

Maybe you have difficulty in finding it.

也许你去找时会有困难。

I have difficulty in understanding her.

要了解她对我来说很困难。

I have difficulty in imagining CotaiJet.

我在联想金光飞航的时候有困难。